Not sure which Pulse / Rev

B

blaze

blaze
Not sure how to work out the Pulse / Revolution switching I'm supposed to be using.
I have done a lot of reading the last couple of days, but I'm getting mixed results. So I thought I would ask here since there are many people smarter than me when it comes to this.
These will be running on my 3 axis (4 motors) Multicam CNC (there is a build thread here for it).

Link to Driver
Link to Stepper

Input 60VDC 6A to the driver.
The below image of the torque curve of the motor states the 2000 micro-steps, is that's what I'm supposed to run?

vxeSlCA.png


FMRj3As.png
 
zombieengineer

zombieengineer

ZombieEngineer
@blaze

Suggest you start with 2000 pulses per revolution.

The stepper/servo has 200 steps/revolution - traditional micro-stepping has a useful limit around 10 micro-steps per full step (10 x 200 = 2000 micro-steps/revolution). The optical encoder appears to have 1000 lines per revolution - these encoders have "quadrature outputs" which means the two optical sensors are out of phase by a line meaning the position should be known within 1/2000 of a revolution.

Therefore any accuracy beyond 2000 pulses per revolution is going to be questionable.

Reality Check - You should know how much the axis advances for 1 revolution of the stepper/servo motor. Is 1/2000th of axis advance smaller than the finest detail you are going to create?



The micro-stepping useful limit relates to the accuracy of actual position vs intended position - for a classic stepper motor the positional accuracy using micro-stepping is about 1/10th a full step. There are a number of issues that contribute to the non-linearity and therefore will vary based on the motor model and stepper motor driver.
 
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